package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        //对前端传来的密码进行MD5加密，防止密码被窃取，用了MD5加密后，窃取到为加密后的密码，
        password=DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }
//    此处之所以形参为EmployeeDTO而不是Employee是为了更好的封装前端数据，Employee类中的一些属性不能让用户直接填写
//    需在后端代码中填写，比如当前新用户创建时间和账号状态等
    public void save(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
//        对象属性拷贝,前提是两个类属性名要一样
        BeanUtils.copyProperties(employeeDTO, employee);
//        设置账号状态，1.正常 0.锁定
        employee.setStatus(StatusConstant.ENABLE);
//        设置密码,先进行MD5加密再传入到数据库中
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));
//        设置账号创建时间和修改时间
//        employee.setCreateTime(LocalDateTime.now());
//        employee.setUpdateTime(LocalDateTime.now());
//        设置当前记录创建人的id
        // 先通过BaseContext这个类中的setCurrentId()方法获取JWT中解析出来的id传入这个类中,再在此处通过get方法获取
//        employee.setCreateUser(BaseContext.getCurrentId());
//        employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.insert(employee);
    }

    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
//        开始分页查询,要用此类必须导入坐标<artifactId>pagehelper-spring-boot-starter</artifactId>
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        Page<Employee> page=employeeMapper.pageQuery(employeePageQueryDTO);
        Long total=page.getTotal();
        List<Employee> records=page.getResult();
        return new PageResult(total,records);
    }

    @Override
    public void startStop(Integer status, Long id) {
//        Employee employee = new Employee();
//        employee.setId(id);
//        employee.setStatus(status);
//        此写法和上面的写法的作用一样，
        Employee employee=Employee.builder()
                .id(id)
                .status(status)
                .build();
        employeeMapper.update(employee);
    }

    @Override
    public void update(EmployeeDTO employeeDTO) {
        Employee employee=new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);
//        employee.setUpdateTime(LocalDateTime.now());
//        employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.update(employee);
    }

    //    根据id查询员工信息
    public Employee getById(Long id){
        Employee employee=employeeMapper.getById(id);
        employee.setPassword("**想看密码？呸**");
        return employee;
    }
}
